According to the answer key, only 29 percent of people got this correct. Correct answer is A. But how?
I think this can be proven with the law of cosines, but that is out of the scope of the test.
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I think its much simpler than that there is a property of obtuse triangle
Let a, b and c are the lengths of the sides of triangle ABC and c is the largest side, then the triangle is obtuse if
a2 + b2 < c2
Does a2 mean a^2 here?
Yeah sorry for the typo